CVE-2020-16120

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It was possible to have a file not readable by an unprivileged user to be copied to a mountpoint controlled by the user, like a removable device. This was introduced in kernel version 4.19 by commit d1d04ef (\"ovl: stack file ops\"). This was fixed in kernel version 5.8 by commits 56230d9 (\"ovl: verify permissions in ovl_path_open()\"), 48bd024 (\"ovl: switch to mounter creds in readdir\") and 05acefb (\"ovl: check permission to open real file\"). Additionally, commits 130fdbc (\"ovl: pass correct flags for opening real directory\") and 292f902 (\"ovl: call secutiry hook in ovl_real_ioctl()\") in kernel 5.8 might also be desired or necessary. These additional commits introduced a regression in overlay mounts within user namespaces which prevented access to files with ownership outside of the user namespace. This regression was mitigated by subsequent commit b6650da (\"ovl: do not fail because of O_NOATIMEi\") in kernel 5.11."}, {"lang": "es", "value": "Overlayfs no realizaba apropiadamente la comprobaci\u00f3n de permisos al copiar archivos en un overlayfs y podr\u00eda explotarse desde dentro de un espacio de nombre de usuario, si, por ejemplo, se permitieran espacios de nombre de usuario sin privilegios.&#xa0;Era posible tener un archivo no legible por un usuario sin privilegios para ser copiado en un punto de montaje controlado por el usuario, como un dispositivo extra\u00edble.&#xa0;Esto fue introducido en la versi\u00f3n 4.19 del kernel mediante la commit d1d04ef (\"ovl: stack file ops\").&#xa0;Esto se corrigi\u00f3 en la versi\u00f3n 5.8 del kernel mediante las commits 56230d9 (\"ovl: verify permissions in ovl_path_open()\"), 48bd024 (\"ovl: switch to mounter creds in readdir\" y 05acefb (\"ovl: check permission to open real file\") .&#xa0;Adem\u00e1s, confirma 130fdbc (\"ovl: pass correct flags for opening real directory\") y 292f902 (\"ovl: call secutiry hook in ovl_real_ioctl()\") en el kernel 5.8 tambi\u00e9n podr\u00eda ser deseable o necesario.&#xa0;Estas commits adicionales introdujeron una regresi\u00f3n en los montajes de superposici\u00f3n dentro de los espacios de nombres de usuarios que impidieron el acceso a archivos con propiedad fuera del espacio de nombres de usuarios.&#xa0;Esta regresi\u00f3n fue mitigada por la subsiguiente Commit b6650da (\"ovl: do not fail because of O_NOATIMEi\") en el kernel versi\u00f3n 5.11"}], "id": "CVE-2020-16120", "lastModified": "2026-06-17T02:57:44.547", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 2.1, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 3.9, 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